Grease gun



Nov. 6, 1945. s. F. czERNER GREASE GUN Filed Oct. 9. 1944 Patented Nov. 6, 1945 UNITED STATES PATENT oFFlcE .j l' j fj'assassi GREASE GUN l n' Severin Ffcz'rner, Kings Miu, Tex. Application October 9, 1944, Serial No. 557,854

3 Claims. (Cl. 222-256) 'Ihe device forming the subject matter of this application is a grease gun. The invention aims to provide novel means whereby in such a structure springs, valves and the like may be dispensed with, grease being ejected by the pulsations of a rotary pump structure, actuated by means which puts pressure on the grease to be ejected.

Within the scope of what is claimed, the structure described and shown may be changed, without departing from the spirit of the invention.

In the drawing:

Figure 1 shows, in longitudinal section, a grease gun constructedin accordance with the invention.

Figure 2 is a transverse section on line 2 2 of Figure 1.

'I'he device forming the subject matter of this applicationincludes a cylindrical barrel B, including a body I, a rear cap 2 being detachably assembled with the body. A screw 3 is held for rotation, but against longitudinal movement, in the cap 2, as shown at 4. 'I'he screw 3 is rotated by means of an external crank 5, or otherwise. A piston B of any desired construction is mounted for reciprocation in the body I. The screw 3 is threaded through the piston E.

A forward cap 1 is detachably mounted on the body I. A nozzle 8 is carried by the cap 1. The cap 'I is provided with an internal track 9. The internal track 9 is eccentric with respect to the longitudinal axis of the body I. The cap 1 has an internal hub Ill. The hub Ill is supplied with an outlet O. The outlet O comprises groove II, extended circumferentially of the hub I0, and a duct I2 in the hub, leading to the nozzle 3.

The hub Ill is supplied with an inlet I. 'Ihe inlet I comprises a circumferentially extended groove I4 in the hub I0, and a duct I5 in the hub, the duct communicating with the interior of the body I. The grooves II and I4 are formed in the periphery of the hub I0, and the grooves are spaced apart, circumferentially of the hub.

A rotor R is mounted to rotate on the hub I. The rotor R comprises an annular body I 6 mounted immediately on the hub I and a spider I 'I assembled with the hub. rIhe spider II has a central seat I8. The screw 3 is provided with a polygonal tip I9, received against rotation in the I Pistons 2| have convex 'ends 22, engaging the eccentric track 9 of cap l.

Lubricant 23 is located in barrel B, between the piston or follower 6 and the cap l. When the screw 3 is rotated by means of the crank 5, the follower 6 is advanced and pressure is put on the lubricant 23. If excessive pressure thus is put on the lubricant 23, the follower 6 will rotate counter-clockwise and tend to travel backwardly in the direction of the arrow A on the threads of the screw 3.

The lubricant 23, under pressure, passes through the duct I5, into the groove I d. The cylinders 20, in communication with the duct I5, receive lubricant under pressure and the corresponding pistons 2I are forced outwardly into engagement with the eccentric track 9 on the cap 1.

The rotor R is rotated by means of the screw 3. As each cylinder 20 comes into communication with the groove I I of the outlet O, the lubricant is discharged through the duct I2, into nozzle 8. The discharge through the duct I2 is effected because the corresponding piston 2I is forced inwardly by the appropriate portions of the eccentric cam track 9. The outlet groove I I affords a time interval for the discharge of lubricant. The groove I4 affords a time interval for the inlet of lubricant.

The device 'forming the subject matter of this application eliminates the conventional levers, exposed plungers, pull-out rods, priming springs, plunger springs, valve springs and valves. Air pockets will not interfere with the operation of the device, since the pumping mechanism will be constantly primed through the instrumentality of the follower 6, which is operated by the screw 3.

Dirt will not accumulate on the pistons 2 I since they are enclosed. Grease which may leak past the pistons 2I will be received within the body I of the`barrel B. The pistons 2| do not operate unless primed by the follower 6. Consequently, the formation of air Dockets in the lubricant is avoided to a maximum extent.

The grease gun may be charged by removing the cap 1, then inserting the open end of the barrel B into an external mass of lubricant and reversing the direction of rotation of the screw 3. Al simple and long-lived structure is afforded. The working parts are readily accessible for repairnr renewal. The device is facile in operation and is actuated without difficulty.

What is claimed:

l. A grease gun comprising a barrel provided at one end with an internal track eccentric withv respect to the longitudinal axis of the barrel, the

barrel being provided at said end with an internal hub concentric with respect to the longitudinal axis of the barrel, the hub having a discharge outlet which opens through the periphery' of the hub, the hub having an inlet which opens at one end through the periphery of the hub and communicates at its opposite end With the interior of the barrel, a rotor journaled on the hub and having cylinders which communicate first with theinlet Aandtthen with `the .outlet asthe rotor is \.ro'tate'd, 'pistons .mounted fto .reciprocate in the cylinders and engaged at their outer ends with the track, to secure inward movement of the pistons while the cylinders are in communication with the outlet, and a combined means carried by the barrel for rotating the rotor, --to bring the cylinders rst into communication with the inlet and then into communication withfth'e outlet, and for putting pressure on the contents of the barrel to charge the cylinders while they are in communication with the inlet.

2. The grease gun of claim 1, wherein the combined means is a screw held in the barrel for rotation, but against longitudinal movement, means for connecting the screw to the rotor to secure rotation thereof, and a piston slidable in the barrel and threaded on the screw.

3. .Thegreasegun of claim .1,.wherein .the inlet comprises v.a circumferentially extended groove in the periphery of the hub, and a duct in the .hub and communicating with the interior of the `barre1 and with the groove, the outlet comprising .ia :c'ircumferentially extended groove in the periphery of the `huh, and a duct in the hub and communicating with the groove.

SEVERIN F. CZERNER. 

